Quote:
Originally Posted by 123Cookie
your speed on your speedometer is based on rotation of tire - when you change the size of the tire - the speed on the speedometer changes - NOT the speed of the cart - you are not going any faster - just your speedometer is no longer accurate!
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Cookie - FYI the speedometer on any vehicle knows nothing about the tire diameter. It either assumes the factory default circumference or allows you to enter a new one in a Setup screen. The speedometer is essentially measuring the RPM of the engine, then calculating the tire rotation in RPM by converting engine speed to tire RPM using the transmission/drive train gear ratios.
Thus if the speedometer is calibrated to think you are going 20 mph at an engine RPM of 4850 with a certain sized tire, and you put a bigger diameter tire on the vehicle, you will then be actually going faster over the ground at that 4850 RPM but the speedometer (not knowing you have changed the tire size) will not be changed but will still be reading "20 mph" at the 4850 RPM engine speed even though you are really traveling faster than that with the new bigger tires.